6. Go to Settings and turn Wi-Fi off. Open Safari and navigate to www.apple.com to verify that you have a data connection. Turn Wi-Fi back on to continue using Wi-Fi for other features. If your cellular data connection isn't available, follow these steps.

7. Verify that you can send and receive SMS. If you are unable to send and receive SMS, see the "Issues with sending and receiving SMS" section, above.

8. MMS may not be available while on a call. Only 3G and faster GSM networks support simultaneous data and voice calls. Learn more about which network your phone supports.

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